Connection block for burners of electric ranges



Nov. 24l 1925. 1,563,211

R. H. MacxNNEs CONNECTION' EIJQCK FOR BURNERS OF ELECTRIC RANG-ES Filed July e. 1925 f1-jl.

abbina,

Patented Nov. 24, 1925.

UNITED STTEVS 1,563,211'sin PATENTi FFCE.

ROBERT H. MACINNES, OIE' HAMILTON, ONTARO, CANADA, ASSIGNOR TO D. MOORE COMPANY,QLIIYIETED, OF HAMILTON, CANADA. i

Appncauon sied my e, 1925. seria; ne. 41,701.

To all whom t may concern:

Be it known that ROBERT H. MACINNES, a subject of the King of Great Britaimvresiding at Hamilton, in the county of 'W entlworth and Province of Ontario, Canada, has invented certain new and useful Improvements in Connection Blocks for Burners of Electric Ranges, of which the following is a specification.

This invention relates to improvements in connections of the main or lead wires with the heating resistance of an electric heating apparatus, and more particularly the invention is applied to the said connections of the burners of electric ranges.

The invention consists essentially of a block `of refractory insulation material demountably secured to the bottom of such a. burner and adapted to hold a connection bolt so that the threaded end of the latter projects beyond the bottom of the block and in such manner that it may readily be detached from the block.

An important object of the invention is to generally improve the construction of the connecting arrangement of the two conductors as set forth.

A second important object is to provide a connection block which is a unit separate from the burner to Which itrelates.

A third important object is to provide i in combination with such a block, a connection bolt which is made rigid with the block previously to the fastening of the wires thereon.

A fourth important object is to provide means to enable the connection bolt to be readily secured to the block for ease in assembling and also to be as readily detached in course of repair.

Another object is to provide a device of the class described which will be simple, durable, efficient, and inexpensive to manufacture.

These, together with other objects, may be attained bythe construction, combination and arrangements of the parts as will be hereinaft .r more fully described, illustrated in the accompanying drawing, and ascertainedin the claims appended hereunto.

Referring to the drawing Figure 1 is a cross-sectional elevation of a burner showing attached thereto a connec tion block in front elevation as constructed in accordance with this invention Figure 2 is a side elevation of the connection block; l

Figure is a cross-sectional front elevation of the connection block taken on the line 3-3 in Figure 2, and, I'

Figure 1 is a cross-sectional side elevation of the connection blocl; taken on the line L1-11 in Figure 1. 7

Similar reference characters refer to similar parts throughout all of the several views.

Burners of electric ranges are usually round or disc shape, and provided with a groove having a tortuous course in the upper surface of the burner. 1n this groove, the helical heating resistance wire is strung. These burners are usually of refractory insulation and usually partially confine-d in a protective metallic casing or pan.

On the drawing is shown in Figure 1 a portion of a burner of the aforesaid type in cross-sectional elevation and indicated by the numeral 10. A portion of the groove is also shown as indicated by 11, and the pan extending across the bottom of the burner and partially over the sides thereof is indicated by 12.

A section of the'helical lic-ating resistance wire is also shown in the groove 11 and is indicated by 14. The ends of this resistance Wire extend through holes 15 in the burner 10, only Vone of these holes being shown on the drawing as the otherlioles are identical and consequently need not be illustrated.

The refractory insulatory connection block preferably of porcelain is indicated by 16. 1f the burner is of the type known as one heat there will be two of these blocks, and if the burner is of the type known as three heat there will be three blocks, as many as there are ordinary connections on single or multiple heat burners, but as'y all the blocks are identical there is but one shown on the drawing.

The block 16 passes through an opening in the pan 12 and abuts the bottom of the burner, and the corresponding end of the blo'clr is provided with opposed flanges 17. rlhese ianges are gripped by the sides 19 of said opening in the pan 12 which are formed so as to receive the flanges in such manner that the block may readily slide in and out of position.

Near one side of the block 16 and extending from top to bottom is a hole 20 adapted to register with the hole 15 in the burner,

and the endy of the resistance wire is eX- tended topass also through the hole20.

Extending inwardly from the front of the block 16 is a groove 21 adapted to receive` the-connection bolt 22, and at the inner or uppermost end of this Groove-is slot 23 to receive theheadQ-f of the said bolt. At the opposite end of the'gioove .2;1 and from the bottom of the block is formed a nut shaped socket 25 to seat the nut-26 so that it will remain stationary while the bolt is threaded through it.

In adjusting the bolt to the block, the nut 26 is threaded a short distance on the bolt 22, and subsequently the bolt is passed to the center of the block through the groove 21 and slot 23, thus, by turning the bolt with the fingers and holding' the nut 26 against rotation, the latter will thread along the bolt until seated in the socket 25, and by continuing to turn the bolt the head will jam against the side of the slot 23, thus producing a rigid fixture. lf desired a washer 27 may be used as additional surface for the bolt head 24 to abut so as to insure against breakage of the porcelain.

The free end of the bolt 22 now projects beneath the block 16 and fori-ns a terminal, around which the ends of the resistance wire if and lead wire 29 are looped in ordinary manner and clamped between the nut 26 and an outer nut 40. Thus if desired for a more permanent connection, a jamb nut itl may be tightened against the second nut 46.

1t is noted that the bolt 22 is positioned in the block merely by the use of the fingers in turning it. It is therefore specified that this introductory procedure is only to position the bolt and consequently a tight preliminary connect-ion between the bolt and the block is not only unnecessary, but it is also undesirable. It is essential only that the nut 26 be confined within its socket to prevent lateral movement of the bolt, and it will be thus observed that the clamping of the ends of the wires between the nuts 26 and 40 will produce the required rigidity for the complete connection.

There has thus been produced a simple and efficient device of the class specified and for the purpose described, and now having completely described the invention and the manner in which it is to be performed, I claim 1. An electrical connecting device comprising a refractory insulation block having a longitudinal groove in one of its latifno aosit groove with its head occupying said slot and Vabutting the endsV of the` groove where they eral surfaces connnunicating with aWtrairs-lv Vmunicating with a nut shaped socket formed in the bottom surface themblpck vat the nd thereof, bolt'i'confined in said converge with theslot, said bolt being provided with a nut adapted to occupy said socket, said nut thereby being restrained from rotation, andA a heating resistance wire and an electrical lead device attached to the protruding end of said bolt so as to form an electrical connection.

2. An electrical connecting device comprising a refractory insulation block having a longitudinal groove in one of its lateral surfaces communicating with a transverse slot at the upper end thereof and in the saine side of the block and also communicating with a nut shaped socket formed in the bot-- toni surface of the block at the opposite end thereof, bolt confined in said groove so that its head occupies said slot and abuts the ends of the groove where they converge with the slot so that its free end protrudes beyond the bottom of the slot, said bolt being provided with a nut adapted to occupy said socket, said nut thereby being restrained from rotation, and a heating resistance wire and an electrical lead device attached to the protruding end of said bolt so as to form an 'electricalconnection 3. An electrical connecting device comprising a refractory insulation block having a T shaped cavity in one of its lateral surfaces and a nut shaped socket formed in the bottom surface of the block communicating with said cavity, a bolt confined within said cavity so that its shank occupies the stein portion ofthe T and its head occupies the cross-head portion of the T so that a p0rtion of the shank extends beyond the bot` tom of the block, said bolt being provided with a nut adapted to occupy said socket, said nut thereby being restrained from rotation, a heating resistance Wire extending through a hole in said block and attached to the protruding end of said bolt, and an electrical lead device also attached to the protruding end of said bolt so as to form an electrical connection.

In testimony whereof l have aiiixed my signature.

ROBERT H. MACINNES. 

